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HD 128311

{{Short description|Star in the constellation Boötes}}

{{Starbox begin}}

{{Starbox image

| image = 250px

| caption = A near infrared (Y band) light curve for HN Boötes, adapted from Strassmeier et al. (2000)

}}

{{Starbox observe

| epoch = J2000

| constell = Boötes

| ra = {{RA|14|36|00.56073}}

| dec = {{DEC|+09|44|47.4536}}

| appmag_v = 7.48

}}

{{Starbox character

| type =

| class = K3V

| b-v = {{val|0.973|0.004}}

| u-b =

| variable = BY Dra

}}

{{Starbox astrometry

| radial_v = {{val|−9.62|0.15}}

| prop_mo_ra = 204.360

| prop_mo_dec = −250.390

| parallax = 61.2111

| p_error = 0.0740

| parallax_footnote =

| absmag_v = 6.39

}}

{{Starbox detail

| source =

| mass = 0.82

| radius = {{val|0.78|0.01}}

| luminosity = {{val|0.308|0.001}}

| temperature = {{val|4863|46|15|fmt=commas}}

| metal_fe = 0.08 dex
0.12

| gravity = 4.58

| rotational_velocity = 5.6

| age_gyr = 0.5–1.0 Gyr
6.35

}}

{{Starbox catalog

| names = {{odlist | BD=+10°2710 | GC=19679 | GJ=3860 | GSC=00910-00165 | HD=128311 | HIP=71395 | V=HN Boo | LTT=14312 | SAO=120554 }}

}}

{{Starbox reference

| Simbad = HD+128311

| ARICNS = 04323

}}

{{Starbox end}}

HD 128311 is a variable star in the northern constellation of Boötes. It has the variable star designation HN Boötis, while HD 128311 is the star's designation in the Henry Draper Catalogue. The star is invisible to the naked eye with an apparent visual magnitude that fluctuates around 7.48. It is located at a distance of 53 light years from the Sun based on parallax, but is drifting closer with a radial velocity of −9.6 km/s. Two confirmed extrasolar planets have been detected in orbit around this star.

The stellar classification of HN Boo is K3V, which indicates this is a K-type main sequence star. Klaus G. Strassmeier et al. announced that the star's brightness varies, in the year 2000. It was given its variable star designation in 2006. It is a BY Draconis-type variable, randomly varying in brightness by 0.04 in magnitude over a period of 11.54 days due to star spots and high chromospheric activity. The star exhibits strong emission, which suggests an age of 0.5–1.0 billion years. It has 82% of the mass of the Sun and 78% of the Sun's radius. The metallicity of the star, meaning its abundance of heavier elements, appears slightly higher than in the Sun. It is radiating 31% of the luminosity of the Sun from its photosphere at an effective temperature of 4,863 K.

Planetary system

{{OrbitboxPlanet begin

| table_ref =

}}

{{OrbitboxPlanet hypothetical

| exoplanet = d

| mass = ≥{{val|0.133|0.005}}

| period = {{val|11.2210|0.0008}}

| semimajor = {{val|0.092|0.004}}

| eccentricity = {{val|0.196|0.030}}

}}

{{OrbitboxPlanet

| exoplanet = b

| mass = ≥{{val|1.769|0.023}}

| period = {{val|453.019|0.404}}

| semimajor = {{val|1.084|0.006}}

| eccentricity = {{val|0.303|0.011}}

| inclination = >30

}}

{{OrbitboxPlanet

| exoplanet = c

| mass = {{val|3.789|0.924|0.432}}

| period = {{val|921.538|1.15}}

| semimajor = {{val|1.740|0.010}}

| eccentricity = {{val|0.159|0.006}}

| inclination = {{val|55.950|14.553}}

}}

{{Orbitbox end}}

In 2002, the discovery of the exoplanet HD 128311 b was announced by Paul Butler. In 2005, the discovery of a second exoplanet HD 128311 c was announced by Steve Vogt.

Most likely, the system has been formed in a very turbulent disc. The authors were able to show with both analytic and numerical models that certain libration modes are readily excited by turbulence. It was initially thought that the system could have been resulted from planet–planet scattering, but this is rather unlikely.

In 2014, the true mass of HD 128311 c was measured via astrometry. The same study also proposed a third planetary candidate, but it has not been confirmed.

Image:Hd128311.png

See also

References

{{Reflist|colwidth=30em|refs=

{{cite journal |last1=Strassmeier |first1=K. G. |last2=Washuettl |first2=A. |last3=Granzer |first3=Th. |last4=Scheck |first4=M. |last5=Weber |first5=M. |title=The Vienna-KPNO search for Doppler-imaging candidate stars |journal=Astronomy & Astrophysics Supplement Series |date=March 2000 |volume=142 |issue=2 |pages=275–311 |doi=10.1051/aas:2000328 |bibcode=2000A&AS..142..275S |doi-access=free }}

{{cite simbad

| title=HD 128311 | access-date=2021-04-06 }}

{{Cite Gaia DR2|1176209886733406592}}

{{cite journal

| last1=Kazarovets | first1=E. V. | last2=Samus | first2=N. N. | last3=Durlevich | first3=O. V.

| last4=Kireeva | first4=N. N. | last5=Pastukhova | first5=E. N. | title=The 78th Name-List of Variable Stars

| journal=Information Bulletin on Variable Stars | date=August 2006 | volume=5721 | pages=1–45

| bibcode=2006IBVS.5721....1K | url=https://ibvs.konkoly.hu/pub/ibvs/5701/5721.pdf

| access-date=6 December 2024}}

{{cite journal

| title=General catalogue of variable stars: Version GCVS 5.1

| last1=Samus' | first1=N. N | last2=Kazarovets | first2=E. V

| last3=Durlevich | first3=O. V | last4=Kireeva | first4=N. N

| last5=Pastukhova | first5=E. N | journal=Astronomy Reports

| volume=61 | issue=1 | pages=80 | year=2017

| doi=10.1134/S1063772917010085 | bibcode=2017ARep...61...80S | s2cid=125853869 }}

{{cite journal

| title=Abundances in the Local Region II: F, G, and K Dwarfs and Subgiants

| last=Luck | first=R. Earle

| journal=The Astronomical Journal

| volume=153 | issue=1 | id=21 | pages=19 | date=January 2017

| bibcode=2017AJ....153...21L | arxiv=1611.02897

| doi=10.3847/1538-3881/153/1/21 | s2cid=119511744 | doi-access=free }}

{{cite journal

| last1=Anderson | first1=E. | last2=Francis | first2=Ch.

| title=XHIP: An extended hipparcos compilation

| journal=Astronomy Letters

| volume=38 | issue=5 | pages=331 | year=2012

| bibcode=2012AstL...38..331A | arxiv=1108.4971

| doi=10.1134/S1063773712050015 | s2cid=119257644 }}

{{cite journal

| title=UBV(RI)CJHK observations of Hipparcos-selected nearby stars

| last1=Koen | first1=C. | last2=Kilkenny | first2=D.

| last3=van Wyk | first3=F. | last4=Marang | first4=F.

| display-authors=1 | journal=Monthly Notices of the Royal Astronomical Society

| volume=403 | issue=4 | date=April 21, 2010 | pages=1949–1968

| doi=10.1111/j.1365-2966.2009.16182.x

| bibcode=2010MNRAS.403.1949K | doi-access=free }}

{{cite journal

| title=Seven New Keck Planets Orbiting G and K Dwarfs

| last1=Butler | first1=R. Paul | last2=Marcy | first2=Geoffrey W.

| last3=Vogt | first3=Steven S. | last4=Fischer | first4=Debra A.

| last5=Henry | first5=Gregory W. | last6=Laughlin | first6=Gregory

| last7=Wright | first7=Jason T. | display-authors=1

| journal=The Astrophysical Journal

| volume=582 | issue=1 | pages=455–466 | date=2003

| doi=10.1086/344570 | bibcode=2003ApJ...582..455B | citeseerx=10.1.1.7.6988 | s2cid=17608922 }}

{{cite journal

| title=On the evolution of mean motion resonances through stochastic forcing: Fast and slow libration modes and the origin of HD128311

| last1=Rein | first1=Hanno | last2=Papaloizou | first2=J. C. B.

| journal= Astronomy and Astrophysics

| date=2009 | volume=497 | issue=2 | pages=595–609

| arxiv=0811.1813 | doi=10.1051/0004-6361/200811330

| bibcode=2009A&A...497..595R| s2cid=12286814 }}

{{cite journal

| title=Five New Multicomponent Planetary Systems

| last1=Vogt | first1=Steven S. | last2=Butler | first2=R. Paul

| last3=Marcy | first3=Geoffrey W. | last4=Fischer | first4=Debra A.

| last5=Henry | first5=Gregory W. | last6=Laughlin | first6=Greg

| last7=Wright | first7=Jason T. | last8=Johnson | first8=John A.

| display-authors=1 | journal=The Astrophysical Journal

| volume=632 | issue=1 | pages=638–658 | date=2005

| doi=10.1086/432901 | bibcode=2005ApJ...632..638V| s2cid=16509245 |

url=https://authors.library.caltech.edu/36250/1/0004-637X_632_1_638.pdf }}

{{cite journal | title=Astrometry, Radial Velocity, and Photometry: The HD 128311 System Remixed with Data from HST, HET, and APT | last1=McArthur | first1=Barbara E. | display-authors=etal | journal=The Astrophysical Journal | year=2014 | volume=795 | issue=1 | page=41 | doi=10.1088/0004-637X/795/1/41 | bibcode=2014ApJ...795...41M | s2cid=122980723 | doi-access=free }}

}}

External links

  • {{cite encyclopedia

| url=http://exoplanet.eu/star.php?st=HD+128311

| archive-url=https://web.archive.org/web/20070702185725/http://exoplanet.eu/star.php?st=HD+128311

| url-status=dead

| archive-date=July 2, 2007

| encyclopedia=Extrasolar Planets Encyclopaedia

| title=Notes for star HD 128311

| access-date=2008-08-18 }}

External links

  • [http://webviz.u-strasbg.fr/viz-bin/VizieR-S?GJ%203860 GJ 3860]
  • [http://www.lpl.arizona.edu/~rory/research/xsp/dynamics/ Extrasolar Planet Interactions] {{Webarchive|url=https://web.archive.org/web/20160505160348/http://www.lpl.arizona.edu/~rory/research/xsp/dynamics/ |date=2016-05-05 }} by Rory Barnes & Richard Greenberg, Lunar and Planetary Lab, University of Arizona
  • [http://aladin.u-strasbg.fr/AladinPreview?-c=14+36+00.5607%2B09+44+47.466&ident=V*+HN+Boo&submit=Aladin+previewer Image HD 128311]

__NOTOC__

{{HD 128311}}

{{Stars of Boötes}}

{{Sky|14|36|00.5607|+|09|44|47.466|54.14}}

Category:K-type main-sequence stars

Category:BY Draconis variables

Category:Planetary systems with two confirmed planets

Category:Boötes

Category:Durchmusterung objects

3860

128311

071395

Boötis, HN